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Selection for hybrid inviability through kin selection

A H Leibowitz1

  • 1Galton Laboratory, Department of Genetics and Biometry, University College London, U.K.

Journal of Theoretical Biology
|September 21, 1994
PubMed
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Modifier alleles decreasing hybrid fitness can be favored by kin selection, especially with low hybrid fertility and sibling competition. Polygamy generally requires lower hybrid fertility but shows stronger selection for these alleles.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Genetics

Background:

  • Modifier alleles can influence hybrid fitness and reproductive success.
  • Kin selection and sibling competition are key factors in the evolution of altruistic traits.

Purpose of the Study:

  • To model the conditions under which modifier alleles reducing hybrid fitness are favored by natural selection.
  • To analyze the role of kin selection and inclusive fitness in the evolution of hybrid inviability.
  • To compare the effects of monogamy and polygamy on the selection of such modifier alleles.

Main Methods:

  • Development of a theoretical model analyzing the evolution of modifier alleles.
  • Inclusion of sib competition and varying degrees of hybrid fertility.
  • Analysis of the model under both monogamous and polygamous mating systems.

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Main Results:

  • Modifier alleles are favored when hybrid fertility is very low and sib competition is present.
  • Polygamy generally requires lower hybrid fertility for modifier allele advantage compared to monogamy.
  • Selection strength for modifier alleles is significantly greater under polygamy, even favoring them irrespective of sib competition if hybrid fertility is extremely low.

Conclusions:

  • Kin selection provides a mechanism for the evolution of reduced hybrid viability.
  • Mating systems, particularly polygamy, can strongly influence the conditions and strength of selection for modifier alleles affecting hybrid fitness.
  • The study highlights the complex interplay between genetic modifiers, hybrid fitness, and mating systems in shaping evolutionary trajectories.